<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>01_JS的三种引用方式</title>
</head>
<body>
<button onclick="alert('点我干嘛')">点我即玩</button>
<button onclick="console.log('点我干嘛')">点我即玩</button>

<h1 id="aaa" >我是许峰崧</h1>
<script>
    console.log('我被执行了');
    console.log(aaa);
</script>
<script src="01.js"></script>
</body>
</html>